MCQ
Fossils are dated now by
- AStratigraphic position
- BAmount of calcium residue
- CAssociation with other animals
- ✓Radioactive carbon $({C^{14}})$ contents
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$(a)$ Caspian $(b)$ Rusiya
$(c)$ Bali $(d)$ Quagga
| Trophic levels | Examples |
| $(A)$ First | $(a)$ Mon |
| $(B)$ Second | $(b)$ Wolf |
| $(C)$ Third | $(c)$ Cow |
| $(D)$ Fourth | $(d)$ Phytoplankton |